Huge global success

May wrote on his blog: "As for unreleased material with Freddie singing… strangely enough I was working on some tapes this evening - with William Orbit. There are a few items in progress. We will have something for folks to hear in a couple of months' time, hopefully.

May also said in 2011 that he was given permission by the Jackson estate to release the pop star's recordings with Queen and Mercury.

Both stars were larger than life, hugely successful global pop singers with millions of fans and massive record sales. Jackson died in 2009 following an overdose of a powerful anaesthetic and Mercury died from an Aids-related condition in 1991.

Earlier this month, comedian Sacha Baron Cohen pulled out of a Freddie Mercury biopic over "creative differences", according to reports.